OK so if i understand correctly you have Green water. Is there any other algea in the tank?
Sorry but I have more questions
What type of lighting?
What K are the bulbs?
How old are the bulbs?
If you have a phosphate test kit what is it reading
How old are you current test kits?
Algea eats phosphates and nitrates. If your live rock was garbage it would not convert ammonia to Nitrite and nitrite to Nitrate. The end of the nitrogen cycle is Nitrate. You rock is not expected to convert Nirtate to anything. Ammonia and Nitrites are toxic to fish. So I would say your rock is doing it's job.
Odds are your Nitrates are not 0 and I'm going to speculate your Phosphates are through the roof.
J
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